How will the city look in the future? How will we live in it? In this interactive mobile story from Mudlark, you're invited to explore the city fifty years into the future, as seen through the eyes of the enigmatic Girl X, unwilling time traveller and your narrator.

Join the conversation about the future...

The story of Derby [2061] is told via the locations on Foursquare, and the Tips left at each one by your narrator, Girl X.

Is Derby a utopia or dystopia, or both? What do YOU think these places will be in 50 years?

Foursquare is a social application - join the conversation about the future by adding to the Tips left by Girl X at each location. The future isn't written yet, so we ask you to be one if its authors...

Find more instructions about how to experience and participate in Derby [2061] in the Begin section.

Derby [2061] is a story about the future. This app serves as an introduction and guide. The whole story is scattered around town for you to find using Foursquare. Read the instructions page to find out how you can help write the next chapter...

Below you'll find a list of the key characters and buildings, click on these to find out more about them. There are fifty places around the city that have been given a future profile, and they can be found using the Foursquare application on your mobile phone. Download Foursquare, and go exploring the city searching for buildings tagged with '2061'!

Mudlark is a production company based in Derby and Birmingham. They cross the boundaries of television, games, and the internet to create new experiences and products.

Their work so far has included Such Tweet Sorrow (a Twitter-based production of Romeo & Juliet for the RSC) and Chromaroma (a game for the London Underground).

Derby [2061] was written and produced by Richard Birkin, with graphic design by James Rice.

Find out more at www.wearemudlark.com

Derby 2061 is an interactive story, meaning that you can leave your mark on it, adding depth to locations that you know, or have ideas about the future of.

The best way of doing this is leaving Tips about the future at locations labelled [2061], using Foursquare. Your narrator, the enigmatic time traveller Girl X has left Tips all over town, trying to paint a picture of a very different tomorrow than what most people imagine.

The pages of this app can only tell you part of the story. The city is out there, and using location-based service Foursquare you can find it on your mobile device.

Fire up the app and search for '2061', or search nearby and see what you can see.

When you're at a location, check-in to it and share the future with your social network. Each location has a Tip from Girl X that gives you some idea as to what goes on here in the year 2061. Don't be afraid to add Tips of your own or ask Girl X a question there.

Foursquare is a location-based mobile platform that makes cities easier to use and more interesting to explore. By "checking in" to locations via the smartphone app you can read snippets of the story via the 'Tips' that Girl X has left around Derby.

• Get Foursquare!

...then come back to the Derby [2061] app for hints and tips on how to use it for this story.

From what we can gather, 'Girl X' is a young female from the year 2061, brought back to Derby in 2011 by something that happened at the 'Smith Atomic Clock Sync Station'. Since arriving, she has avoided direct contact with individuals, instead using social networks and apps to tell us what will happen here in the future.

Here are her current whereabouts online (although if you find her elsewhere, please notify us at derby2061@wearemudlark.com):

One of the largest corporations in the world in the year 2061, this Derby technology company developed a way to encode people's memories in formats that they could sell for other people to experience.

Thus began the 'Memory Culture' that Girl X talks about. So addictive and realistic were these 'memories' that most forms of mainstream culture died out as people favoured the internal experience rather than the external.

The company base themselves in what is currently Darley Mills in Darley Abbey, but have huge production houses and complexes of Server Farms across the city, creating the "ever present hum" that can be heard in the Derby of the future.

A 200 year old company known in the present as 'Smith of Derby'. We're led to believe that at some point in the next 50 years they develop a technology able to synchronise all time pieces on Earth, the Moon, and Mars. As such Derby becomes known as 'The Centre of Time'. According to the entries on Foursquare they are based in the same location as the present, with their 'Clock Sync Station' situation in what is currently the Old Clockworks on Queen Street.

Girl X consistently alludes to Smith Atomic for bringing her here to 2011.